METHOD OF PRODUCING PHOSPHONATES FROM DIALKYL PHOSPHITES AND UNSATURATED CARBOXYLIC ACID DERIVATIVES Russian patent published in 2015 - IPC C07F9/40 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing phosphonates of formula (1) , where R¹=Me, Et, i-Pr; R²=H, Me, CH₂CO₂Me; X=CO₂Me, CN, CONH₂, which are used in chemical industry. In the disclosed method, said phosphonates are obtained from dialkyl phosphites and unsaturated carboxylic acid derivatives using tri-n-butylphosphine as a catalyst at 15-20°C in acetonitrile solution. Concentration of tri-n-butylphosphine in the reaction mixture varies from 5 to 70 mol%. The unsaturated carboxylic acid derivative is added in the form of a solution with concentration of 5 mol/l in droplets to a stirred mixture of dialkyl phosphite and tri-n-butylphosphine. The reaction mixture is held for 0.5-3 hours, followed by removal of acetonitrile by low-pressure distillation and extracting the desired phosphonates from the reaction mixture.

EFFECT: improved method.

3 cl, 14 ex, 1 tbl, 1 dwg